CVE-2026-111136 libInstPatch through 1.1.7 Heap Out-of-Bounds Write via ipatch_sf2_gen_is_valid
Attackers can execute arbitrary code or cause denial of service via crafted SoundFont files exploiting a heap out-of-bounds write in libInstPatch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-111136?
CVE-2026-111136 is a medium-severity memory corruption vulnerability in swami libinstpatch, published on 15 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
libInstPatch through 1.1.7 contains a heap out-of-bounds write vulnerability in the SoundFont 2 loader because ipatch_sf2_gen_is_valid() does not range-check generator IDs before the validity mask test. Attackers can supply crafted SF2 files with out-of-range pgen or igen generator IDs to write attacker-chosen values past the zone genarray, corrupting heap memory and crashing Swami or other consumers.
Weakness: CWE-787
Which versions are affected by CVE-2026-111136?
Linux distribution packages (1)
libinstpatch openSUSE:Tumbleweed | All versions | 1.1.8-1.1 |
How do I fix CVE-2026-111136?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-111136 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111136 exists.
Sources
Also known as DEBIAN-CVE-2026-111136, ECHO-e2bb-3785-63b6, GHSA-6p4q-22pq-927g, UBUNTU-CVE-2026-111136, openSUSE-SU-2026:12199-1.